A product comparison displayed on a white background divided into two sections by a plus symbol. On the left is a single black Darn Tough Micro Crew Lightweight Tactical Sock shown with the Darn Tough Vermont logo and product name below it. On the right is a single black Massif Flamestretch Sock shown with the Massif logo and product name below it. The socks appear to be crew length

Flamestretch® Sock System (FR)

$97.97SKU: #MSOX00001



The Flametretch® Sock System combines an inner low-profile wool sock with an outer over-sock for a system that provides comfort and support in all normal and wet conditions. The inner sock, by Darn Tough, has excellent moisture management and stays warm while wet. The outer sock is constructed with our proprietary Flamestretch® brushed-back knit fleece fabric that features DuPont™ Kevlar® and Nomex® brand fiber – the first flame-resistant fiber selected for use in military uniforms.

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Description

The Flametretch® Sock System combines an inner low-profile wool sock with an outer over-sock for a system that provides comfort and support in all normal and wet conditions. The inner sock, by Darn Tough, has excellent moisture management and stays warm while wet. The outer sock is constructed with our proprietary Flamestretch® brushed-back knit fleece fabric that features DuPont™ Kevlar® and Nomex® brand fiber - the first flame-resistant fiber selected for use in military uniforms.

Features

  • 2 sock system featuring inner Darn Tough sock
  • Flat seam construction for comfort
  • Ultra-soft interior with exceptional wicking for moisture management



View Tech Sheets

Finding your perfect fit couldn’t be easier—just start with your shoe size. Each sock size spans a 2–3 shoe size range, delivering a comfortable, performance-driven fit that moves with you. Their natural stretch adapts to different foot shapes, but nothing beats the feel of a sock that’s sized just right. If you’re between sizes, simply size up. Example: Your shoe size is your guide: a men’s size 11 shoe calls for a men’s large sock (fits sizes 10–12).The right fit means your socks work as hard as you do—mission after mission, day after day.

For metric measurements, follow the above instructions and refer to our sizing chart for guidance.

Sock Sizing Information

Sock Size

Men US

Women US

EU

UK

XSmall

–

–

35 – 38

2.5 – 4.5

Small

5.5 – 7.5

7.5 – 9.5

38 – 40

5 – 7

Medium

8 – 9.5

10 – 11.5

41 -42

7.5 – 9

Large

10 – 12

12 -14

43 – 45

9.5 – 11.5

XLarge

12.5 – 14.5

–

46 – 49

12 -14

XXLarge

–

–

50 – 53

15 – 16

Description

The Flametretch® Sock System combines an inner low-profile wool sock with an outer over-sock for a system that provides comfort and support in all normal and wet conditions. The inner sock, by Darn Tough, has excellent moisture management and stays warm while wet. The outer sock is constructed with our proprietary Flamestretch® brushed-back knit fleece fabric that features DuPont™ Kevlar® and Nomex® brand fiber - the first flame-resistant fiber selected for use in military uniforms.

Features

  • 2 sock system featuring inner Darn Tough sock
  • Flat seam construction for comfort
  • Ultra-soft interior with exceptional wicking for moisture management

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View Tech Sheets

Finding your perfect fit couldn’t be easier—just start with your shoe size. Each sock size spans a 2–3 shoe size range, delivering a comfortable, performance-driven fit that moves with you. Their natural stretch adapts to different foot shapes, but nothing beats the feel of a sock that’s sized just right. If you’re between sizes, simply size up. Example: Your shoe size is your guide: a men’s size 11 shoe calls for a men’s large sock (fits sizes 10–12).The right fit means your socks work as hard as you do—mission after mission, day after day.

For metric measurements, follow the above instructions and refer to our sizing chart for guidance.

Sock Sizing Information

Sock Size

Men US

Women US

EU

UK

XSmall

–

–

35 – 38

2.5 – 4.5

Small

5.5 – 7.5

7.5 – 9.5

38 – 40

5 – 7

Medium

8 – 9.5

10 – 11.5

41 -42

7.5 – 9

Large

10 – 12

12 -14

43 – 45

9.5 – 11.5

XLarge

12.5 – 14.5

–

46 – 49

12 -14

XXLarge

–

–

50 – 53

15 – 16

Care Instructions

  • Machine wash cold
  • No bleach
  • No liquid softener
  • Tumble dry low
  • Do not dry clean

Specs + Approvals

  • All fabrics pass the ASTM D6413/F2302 performance specification for flame-resistance.
  • Approved by AFSFC Cold Weather Gear (CWG)
  • U.S. Coast Guard Approved
  • National Business Center, Aviation Management Directorate (AMD) approved for wear under a flight suit or under the yellow shirt and green pants for wear under a flight suit or under the yellow shirt and green pants

Care Instructions

  • Machine wash cold
  • No bleach
  • No liquid softener
  • Tumble dry low
  • Do not dry clean

Specs + Approvals

  • All fabrics pass the ASTM D6413/F2302 performance specification for flame-resistance.
  • Approved by AFSFC Cold Weather Gear (CWG)
  • U.S. Coast Guard Approved
  • National Business Center, Aviation Management Directorate (AMD) approved for wear under a flight suit or under the yellow shirt and green pants for wear under a flight suit or under the yellow shirt and green pants

The Flametretch® Sock System combines an inner low-profile wool sock with an outer over-sock for a system that provides comfort and support in all normal and wet conditions. The inner sock, by Darn Tough, has excellent moisture management and stays warm while wet. The outer sock is constructed with our proprietary Flamestretch® brushed-back knit fleece fabric that features DuPont™ Kevlar® and Nomex® brand fiber - the first flame-resistant fiber selected for use in military uniforms.

Features

  • 2 sock system featuring inner Darn Tough sock
  • Flat seam construction for comfort
  • Ultra-soft interior with exceptional wicking for moisture management



View Tech Sheets

Finding your perfect fit couldn’t be easier—just start with your shoe size. Each sock size spans a 2–3 shoe size range, delivering a comfortable, performance-driven fit that moves with you. Their natural stretch adapts to different foot shapes, but nothing beats the feel of a sock that’s sized just right. If you’re between sizes, simply size up. Example: Your shoe size is your guide: a men’s size 11 shoe calls for a men’s large sock (fits sizes 10–12).The right fit means your socks work as hard as you do—mission after mission, day after day.

For metric measurements, follow the above instructions and refer to our sizing chart for guidance.

Sock Sizing Information

Sock Size

Men US

Women US

EU

UK

XSmall

–

–

35 – 38

2.5 – 4.5

Small

5.5 – 7.5

7.5 – 9.5

38 – 40

5 – 7

Medium

8 – 9.5

10 – 11.5

41 -42

7.5 – 9

Large

10 – 12

12 -14

43 – 45

9.5 – 11.5

XLarge

12.5 – 14.5

–

46 – 49

12 -14

XXLarge

–

–

50 – 53

15 – 16

Description

The Flametretch® Sock System combines an inner low-profile wool sock with an outer over-sock for a system that provides comfort and support in all normal and wet conditions. The inner sock, by Darn Tough, has excellent moisture management and stays warm while wet. The outer sock is constructed with our proprietary Flamestretch® brushed-back knit fleece fabric that features DuPont™ Kevlar® and Nomex® brand fiber - the first flame-resistant fiber selected for use in military uniforms.

Features

  • 2 sock system featuring inner Darn Tough sock
  • Flat seam construction for comfort
  • Ultra-soft interior with exceptional wicking for moisture management

[get_flame_resist_shortcode]

View Tech Sheets

Finding your perfect fit couldn’t be easier—just start with your shoe size. Each sock size spans a 2–3 shoe size range, delivering a comfortable, performance-driven fit that moves with you. Their natural stretch adapts to different foot shapes, but nothing beats the feel of a sock that’s sized just right. If you’re between sizes, simply size up. Example: Your shoe size is your guide: a men’s size 11 shoe calls for a men’s large sock (fits sizes 10–12).The right fit means your socks work as hard as you do—mission after mission, day after day.

For metric measurements, follow the above instructions and refer to our sizing chart for guidance.

Sock Sizing Information

Sock Size

Men US

Women US

EU

UK

XSmall

–

–

35 – 38

2.5 – 4.5

Small

5.5 – 7.5

7.5 – 9.5

38 – 40

5 – 7

Medium

8 – 9.5

10 – 11.5

41 -42

7.5 – 9

Large

10 – 12

12 -14

43 – 45

9.5 – 11.5

XLarge

12.5 – 14.5

–

46 – 49

12 -14

XXLarge

–

–

50 – 53

15 – 16

Care Instructions

  • Machine wash cold
  • No bleach
  • No liquid softener
  • Tumble dry low
  • Do not dry clean

Specs + Approvals

  • All fabrics pass the ASTM D6413/F2302 performance specification for flame-resistance.
  • Approved by AFSFC Cold Weather Gear (CWG)
  • U.S. Coast Guard Approved
  • National Business Center, Aviation Management Directorate (AMD) approved for wear under a flight suit or under the yellow shirt and green pants for wear under a flight suit or under the yellow shirt and green pants

  • Machine wash cold
  • No bleach
  • No liquid softener
  • Tumble dry low
  • Do not dry clean

  • All fabrics pass the ASTM D6413/F2302 performance specification for flame-resistance.
  • Approved by AFSFC Cold Weather Gear (CWG)
  • U.S. Coast Guard Approved
  • National Business Center, Aviation Management Directorate (AMD) approved for wear under a flight suit or under the yellow shirt and green pants for wear under a flight suit or under the yellow shirt and green pants

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